Nanotechnology and nanocomposites -- Fiber technology -- Nanofibers -- Electrospinning -- Nanocomposite nanofibers -- Melt spinning -- Originality of the work -- Materials, processing and characterization -- Processing and mixing procedure -- Morphology, structure and properties of conductive PS/CNT nanocomposite electrospun mat -- Fundamental study of crystallization, orientation and final properties of electrospun PET/carbon nanotube nanofibers -- Structure and properties of melt-spun PET/MWCNT nanocomposite fibers -- Empirical modeling of electrospun CNT-based nanocomposite nanofibers